Change input fields border color?

The easiest way is to use the plugin styling page. Check the ‘use custom CSS’ and add the following to the text editor:

#qcf-style input, #qcf-style textarea, #qcf-style select, #qcf-style #submit {border:1px solid #111111;}

Where the #111111 is your border colour. Save the settings and that should be you sorted.

I can’t get it working. Did I enter the CSS wrong? I’m not a power user…
Here’s a screenshot:
https://i.imgur.com/VKRQ8.png

Check the source code of your site. In the header you should see the the style, if you can’t then it’s possible you have some restrictions on your WP installation.

The alternative to using custom CSS is to edit the plugin CSS. Click on the ‘CSS editor’ link on the plugin styling page and change the border colour as necessary.

This file will get over written when I issue new versions of the plugin but as long as you keep a copy locally you will be able to add your colours.